Fix my small Java app

Hi. I have a simple java app that updates a mysql database based on what it returns from running a stock check via another java based catalog from my supplier. The app had been working fine, but I changed the configuration so that it would connect to a different database after I deleted the old database, but now it has stopped working. I have an older version of the app that doesn't connect to the mysql database and that works fine, so I guess it must have something to do with what tables are being read and updated. Anyway, I need it fixing and adapting so that whatever you change in the app can be changed in future by myself in a config file. I'll give you the app if you pm me. Quick job so budget is $30 Thanks